Carbureter for explosion-engines.



No. 747,264. y PATENTED DEC. 15, 1903. I. L. & :13. J. STURTEVANT.

CARBURETEB. FOR EXPLOSION ENGINES.

APPLICATION FILED MAY 29. 1902.

no MODEL.

2 SHEETS-SHERRI.

No; 747,264. PATENTED'DEG. 15, 1903. 'T. L, & T. J. ,BTURTEVANTL YGARBURETER FOR EXPLOSION ENGINES.

APPLIOATIDN FILED MAY 29, 1902'.

2 SHEETS-SHEET 2.

no MODEL.

m: qnms PETERS co Pno'mumo; WASHINGTON. n c

' UNTTE Patented December 15, 1903.

PATENT Trice.

THOMAS In STURTEVANT, OF QUINCY, AND THOMAS J. STURTEVANT, OF NEWTON CENTER, MASSACHUSETTS.

CARBUETER FOR EXPLOSION ENGlNES.

SPECIFICATION forming part of Letters Patent No. 747,264, dated December 15, 1903.

Application filed May 29, 1902. Serial No. 109,432. (No model.)

To all whom it may concern.-

Be it known that we, THOMAS L. STURTE- VANT,residing at Quincy,in the county of Norfolk, and THOMAS J. STURTEVANT, residing at Newton Center, in the county of Middlesex, State of Massachusetts, both citizens of the United States, have invented certain new and useful Improvements in (larbureters for Explosion-Engines, of which the following is a to specification, reference being had therein to the accompanying drawings.

This invention relates to that class of carburetors for gas orexplosion engines in which the explosive mixture of airand gas is produced by mingling a spray of a liquid hydrocarhon with a current of air passing through the carbureter; and the invention has for its object to provide a carburetor of the class referred to which While of comparatively simple construction will provide for the automatic regulation of the fuel-supply simulta neously with the variation of the position of the throttle-valve by which the speed of the engine is regulated, which will provide a combined air-inlet and vacuum-regulating valve, serving also as a check-valve to prevent the escape of the explosive mixture or fuel spray from the carbureter when explosions occur and the mixture rebounds upon the closing of the engine-valve, which will provide between the fuel-inlet and the exit or exits for the explosive mixture controlled by the throttle-valve a breaking or dividing and mixing screen on which any particles of unvaporized liquid fuel may be thrown, so as to be readily broken up and absorbed or vaporized, and which. screen prevents particles of solid matter contained in the fuel from entering the engine, and which carbu- 0 reter will also provide a conical or flaringjacketed air accelerating and mixing chamber which may be heated to facilitate the vaporization of the liquid hydrocarbon.

The invention also relates to some details of construction, which will be hereinafter referred to, as well as to certain novel combinations of the general features above indicated.

In the accompanying drawings, Figure 1 is a vertical sectional view of the improved carbureter. Fig. 2 is a horizontal section on line 22, Fig. 1. Fig. dis a horizontal section on line 3 3 of Fig. 1, showing the throttlevalve-regulating lever and connected parts in plan view. Fig. at is a detail view of a part of the oil-reservoir to show an overfiowcock for the reservoir. Fig. 5 is a View of a carburetor embodying the same principles that have been set forth in connection with the form shown in the other views, illustrating other mechanical expedients for obtaining the same results. Fig. 6 is a detail of the throttie-valve used in the form of carbureter shown in Fig. 5.

12 denotes the frame ofthe apparatus, ,consisting, preferably, of a casting of brass or other suitable material. Surmounting the frame 12 is a cone 13, the interior of which provides a conical or funnel-shaped air-chamber, said cone being provided with a cap 14, having a central hub 15, which receives the stem 16 of an air-inlet and vacuum-regulating check-valve consisting of a disk 17, attached to said stem and. cooperating with airinlet openings 18, with which the said cap 14 is provided. The valve-stem 16 is preferably provided with a regulating-nut 19, between which and the top of the said hub is interposed a light coil-spring 20, serving to normally hold the valve-disk 17 against the inside of the top of said cap, thus closing the said air-inlet openings. By changing the position of the said nut the stress of said spring may be varied as may be desired and the said regulating-nut may be retained in any desired position of adjustment by a setnut 21.

Communicating with the contracted lower end of the conical or funnel shaped airchamber within the cone 13 is a conical jacketed mixing-chamber 22, the smaller end of which is contiguous to the said contracted end of the said air'chamber, and the larger end of which mixing-chamber is toward the exit of the carburetor.

Suitably attached to the frame 12 is a fuel- 5 reservoir 23, the exitopening 24 of which communicates with a fuel-inlet 25 for the mixing-chamber 22, controlled by the needlevalve 26. The reservoir 23 is provided with a needle-valve 27, which controls the fuel- 10o flow of the liquid fuel to the reservoir.

inlet opening 28 for the reservoir 23, the stem I which consists, preferably, of two or more of the said needle-vale being provided with a collar 29, resting upon the inner ends of levers 30, the outer ends of which are to be acted on by a float 31 within the said fuelreservoir. Attached to the upper end of the stem of the needle-valve is a weight 32, which weight when the level of the liquid fuel in the reservoir is sufficiently high to lift the float will hold the said needle-valve to its seat; but when the level of the liquid falls, so that the float will descend and engage the outer ends of the levers 30, the shorter inner ends of said levers acting upon the collar 29 on the stem of the needle-valve will lift the said Valve from its seat, and thus permit in- The said reservoir 23 is provided with an overflow-cock which, as shown in Figs. 1 and 4, consists of a needle-valve 50, screw-threaded in a seat 51, formed in the wall of the reservoir 23 and adapted to control the overflowport 52, an overflow-passage 53 leading from the port-passage to permit escape of oil. This overflow-cock may be left open, if desired, to permit the escape of oil and guard against flooding the reservoir 23 if the oil should at any time rise too high in said oil-chamber on account of the possible defective action of or leakage at the needle-valve 27, so that a constant oil-level may be insured in the floatchamber, or it may be kept normally closed and may be opened at intervals to ascertain if there is an excess of oil in the reservoir and if this be the case permit its escape, thus enabling the operator to ascertain and regu late the fuel-supply to some extent independently of the automatic regulation afforded by the float-controlled inlet-valve hereinbefore described. The port 52 of the outlet-cock is preferably placed slightly below the plane of the outlet-passage 25, which admits oil to the mixing-chamber 22, it being understood that the fuel is drawn into the mixing-chamber 22 from the main supply by suction and does not enter by natural overflow.

Seated in a suitable chamber in the lower portion of the frame 12 is a circular rotatable throttle-valve 33,provided with suitable openings 34, which, in cooperation with similar openings 35, formed in a stationary plate or base 36, serve to regulate the egress of the explosive mixture from the carbureter to the engine. Interposed between the conical mixing-chamber 22 and the exit passage or passages or openings 34 of the throttle-valve 33 is a breakingup or dividing and mixing screen or screens 37, of fine wire-gauze, and which screen will receive any unvaporized particles of the liquid fuel, so as to break up or divide the same, and thus expose the liquid fuel more efficiently to the vaporizing action of the passing mixture of gas and air, so that the liquid fuel will all be thoroughly vaporized before it reaches the explosionchamber of the engine. The said screen,

separated disks of fine or gauze wire secured to the peripheral flange of the hollow body of the throttle-valve, also prevents any dust and solid particles of matter from entering the engine and clogging the valves thereof or interfering with the proper operation of the engine.

The throttle-valve 33 is provided with a handle or lever 38, by which the said valve may be turned as desired, and attached to the said handle is a controlling cam-plate 39, the inner edge of which is eccentric to the axis of the said valve.

Attached at its upper end to the frame 12 is a spring regulating-lever 40, which is provided with a valve-spring 41, engaging shoulders on the stem of the fuel-regulating needle-valve 26 and normally tending to press the said valve to its seat. The position of said valve relative to its seat may be regulated by the nut 42 on the threaded outer end of the stem of the said valve and which nut presses against the outer face of the spring regulating-lever 40. By turning the said nut the position of the said fuel-inlet valve relative to said spring-lever may be varied as may be desired and the said nut may be secured in any desired position of adjustment on the valve-stem by the set-nut 43. The spring regulating-lever 40 has an outward stress or tendency, partly induced by the' spring 41, which controls the needle-valve 26, and the outward movement of the said springlever may be limited to secure any desired adjustment of said lever relative to the coutrolling-plate 39 by means of a screw 44, threaded in the frame 12 and having a head which abuts against the said regulating-lever.

The wall of the conical mixing-chamber 22 is jacketed by the circular or nearly circular chamber 45 within the frame 12 and which chamber 45 is provided with inlet and outlet openings 46 47, so that the-chamber may be connected either with the hot exhaust of the engine or with the cylinder-cooling water circulation, so that water which has been heated in the cooling operation may pass into the said chamber 45 and heat the Wall or jacket of the said mixing-chamber, thereby facilitating or expediting the evaporation of the liquid fuelintroduced into the said chamber and preventing any frost, which in cold weather sometimes results from the evaporation of the liqued fuel, from accumulating.

In the operation of the engine the suction from the engine induces a partial vacuum within the carbureter, thus drawing in the liquid fuel at the entrance controlled by the needle-valve 26, and when the partial vacuum is sufficient to overcome the resistance of the spring 20, which controls the air-inlet and check-valve 17, air is drawn into the air-chamber of the carbureter and its movements accelerated by expanding in the conical mixing-chamber 22 and being mixed with the liquid fuel vaporizes the same to form the explosive mixture for use in the engine. Owing to the conical shape of the mixingchamber, the movementof the air in the carburetor is accelerated by expanding and increases rapidly with the speed of the engine, so that when more air is drawn into the carbureter'bythe increased speed and suction it is necessary in order that too much fuel may not be drawn into the carbureterto partly close the fuelinlet valve as the throttle-valve is turned to open the throttle, and thus increase the speed of the engine, and to this end the controllingplate 39 on the operating handle or lever 38 of the said throttle-valve is so arranged as to engage the lower end of the spring-lever 4:0 and force the said lever inward to partly close the fuel-controlling needle-valve as the said throttle-valve is turned to open its passages more widely. This automatic regulation of the fuel-supply needle-valve with the I opening and closing movements of the throtlever of said throttle-valve, so that its position may be adjusted as desired, such adjustment being effected in the construction herein shown by forming a slot,as 48, through which one of the attaching-screws 49 can pass, so that by loosening the said screws the position of said plate relative to the said handle or lever may be changed somewhat, as circumstances may require.

The air-inlet and vacuum-controlling and check valve 17 is an important feature ofthe improved carburetor in that the extent of the partial vacuum, and consequently the fuelindrawing suction, can be controlled to a nicety by the said valve and by the proper regulation of the spring 20, and the action of the said valve as a check-valve is a valuable feature in that it prevents the escape of any of the explosive mixture or fuel-vapor when explosions and rebounds occur. Owing to the fact that the said valve is of large area as compared with the outlet from the conical airchamber within the cone 13 or as compared with the cross-sectional area of the mixing-chamberof the carbureter, the said valve is very sensitive in its operations, and when the engine is throttled down, so that the entering air-current has the least velocity, the airsupply will still be sufficient, owing to the sensitive operations of the said air-valve, which will work eficiently with a comparatively small pullor indraft of suction, which would not bethe case if the vacuum-valve were a small one in comparison with the area of the outlet of the air-chamber. The conical mixing-chamber of the carbureter conduces, as

bracket-arm on the frame.

has hereinbefore been stated, to accelerate the indraft-suction of the liquid fuel and which suction with this form of mixing-chamber increases rapidly Iin proportion to the speed of the engine, so that while in many carburetors heretofore in use it has been necessary to open the fuel-inlet wider when the speed of the engine was increased the increased suction of our improved carbureter, due to the conical mixing-chamber having its larger end toward the throttle-valve," requires the fuel-valve to be closed somewhat as the throttle-valve is openedthat is to say, as the engine runs faster it needs more fueland owing to the increased suction or accelerated air-current such increase in the amount of fuel in finely-sprayed and minutely-divided condition is secured notwithstanding the fact that the fuel-entrance valve is closed somewhat as the throttle-valve is opened. Another advantage resulting from the conical or flaring shape of the mixing-chamber 22, with its smaller end toward the air-inlet chamber and its larger end toward the throttle-valve, is the very light vacuum which is required to insure a proper feed of the fuel to the engine. In other words, with our improved construction the suction or pull against the engine is very light, so that the engine-power is not diminished thereby, as occurs in many explosion-engines heretofore in use and in which the vacuum pull on the engine-piston diminishes the engine-power.

In the form of carbureter shown in Figs. 5 and 6 the jacketed and conical mixing-chamber, the conical airchamber surmounting the same, the netted chamber in the lower portion of the carbureter-frame, the oil-reservoir, and the fuel and oil controlling valves are substantially the same as in the form of carburetor shown in Figs. 1 to 3, inclusive, the

mechanical construction differing slightly,

but withoutchanging the principles involved. The throttle-valve 54:, as shown in Fig. 5, is mounted in the lower end of the carbureterframe and controls the engine supply-ports in a manner similar to the throttle-valve shown and described hereinbefore. Said throttle-valve 54 is provided with a controlling-lever 55, attached to a stem depending from the throttle valve 54 and passing through the outlet-chamber 56, which leads to the engine. The said throttle-valve 54 has upon its upper face a cam-plate 57, eccentrically placed relative to the center of rotation of the throttle-valve, as clearly shown in Fig. 6. Said cam-plate 57 bears against the inner end of a sliding pin 58, mounted in the side of the carbureter-frame, as clearly shown in Fig. 5, the outer end of said pin 58 hearing against a lever 59, pivotally hung from a The needlevalve 61 isprovided with a regulating springlever 62, similar to the lever shown in Fig. 1, said lever 62 being attached at its upper end to the frame of the carbureter and having a spring 63- bearing against shoulders on the stem of the needle-valve 61, a regulating-nut 64 to regulate the position of the needle-valve 61 relative to its seat being provided, as in the construction hereinbefore described. The said regulating-lever 62 is slotted at its lower end, as shown in Fig. 5, and mounted in the said slotted end of lever,62 is a sliding block 65, having a clamping-nut 66, by means of which it may be firmly clamped to the slotted end of the lever 62 and held in any desired position of adjustment thereon. The contact-block 65 normally bears against the outer face of the lever 59, and any movements imparted to the lever 59 will be transmitted to the regulating-lever 62 and imparted to the needle-valve 61. It will be readily seen that by adjusting the contact-block 65 toward or away from the pivot of the lever 59 the extent of movement of the needle-valve-regulating lever 62 may be varied, for if the contact-block be directly at the pivotal point of the lever 59 the movements of the said lever 59 will not affect the needle-valve-regulating lever 62, while by adjusting the said contact-block 65 in the slotted end of the lever 62 so that it bears upon the lever 59 at its lower end the extreme throw of the lever 59 will be transmitted to the valve-regulating lever 62 and by it imparted to the needlevalve 61. From the foregoing it Will be seen that when the throttle-valve 54 is rotated by its controlling-lever 55 the eccentric camplate 57 will force the sliding pin 58 outwardly, swinging the lever 59, and through the regulating-lever 62 impart the desired movement to the needle-valve, so as to control the supply of fuel to the mixing-chamber in accordance with the position of the said throttle-valve, and that by simply adj ustin g the contact-block 65 the relative movements of the throttle-valve and the needlevalve may be very finely adjusted.

The oil-reservoir or float-chamber has depending from its bottom the valve-seat 67, said valve-seat being provided with an elongated stem 68, having inlet openings 69 therein, and said inlet-openings are preferably protected by means of acylindrical screen 70 surrounding the stem, the said screen and stem being inclosed in a removable sedimenttrap 71, secured to said stemby means of a screw-bolt 72 in the manner shown, a main supply-pipe 73 entering said removable trap By this construction danger of any foreign particles in the oil entering the reservoir is reduced to a minimum, for the protectingscreen 70, while admitting the oil to the inlets 69, will prevent any foreign matters passing to said inlets, such foreign particles falling to the bottom of the trap 71, the lower end of the trap depending some distance below the end of the stem 68 and its surrounding screen, so as to form a pocket to receive the foreign matter entering the trap and prevent its banking against the screen or choking the supplyopening. The foreign matter collected may be readily removed by simply detaching the trap from the elongated stem of the valveseat. The supply-opening 73 is preferably a nipple integral with said trap, as shown in Fig. 5, and by loosening the screw-bolt 72 the said trap may be adjusted axially on the stem 68 to turn the supplyopening in any desired direction. The oilreservoir is preferably provided with a gage 74:, communicating with the float-chamber, in order that the level of the oil in said floatchamber may be readily determined, and the overflow-cock shown in Fig. at, but not appearing in Fig. 5, is also provided to guard against flooding of the oil-chamber, as has already been described.

The invention is not to be understood as being limited to the details herein shown and described, as these may be varied widely without departing from the essence of the invention. Also while we prefer to automatically regulate the fuel-inlet valve from the throttle-valve, as herein shown and described, it will be understood that the connections between the said valves might be so arranged that the throttle-valve might be opened and closed more or less by the opening and closing of the fuel-inlet valve.'

Having thus described our invention, we claim and desire to secure by Letters Patentl. In acarbureter for explosion-engines, the combination with a throttle-valve for the vapor-outlet thereof, of a valve controlling the fuel-inlet to the carbu-reter, and connections between said throttle-valve and said fuel-inlet valve to impart positive closing movements to the latter when the throttlevalve is opened.

2. In a carbureter for explosive-engines, the combination with a throttle-valve for the vapor-outlet thereof, of a valve controlling the fuel-inlet to the carbureter, connections between said throttle-valve and said fuel-inlet valve to impart positive-closing movements to the latter when the throttle-valve is opened, and means for adjusting the connections between said valves to regulate their movements relative to each other.

3. In a carburetor for explosive-engines provided with a mixing-chamber, the combination of a throttle-valve controlling the outlet therefrom, a fuel-inlet valve therefor, operating connections between said throttle and fuel-inlet valves to positively close thelatter when the former is opened, and a vacuumcontrolling air-inlet and check valve for said chamber.

4.. In a carburetor for explosion-engines provided with a flaring mixing-chamber, the combination with throttle andfuel-supply valves, of a vacuum-controlling, air-inlet and check valve, said flaring mixing-chamber having its larger end toward the said throttle- IIO valve and its smaller end toward said air-inlet and check valve.

5. In a carburetor for explosion-engines provided with a conical or flaring air-accelerating mixing-chamber the combination with throttle and fuel-supply valves, of a springpressed vacuum'controlling, ai'r inlet valve, said conical or flaring air-accelerating mixing-chamber having its larger end toward the said throttle-valve and-its smaller end toward said air-inlet valve.

6. In a carbureter for explosion-engines provided with a flaring air-accelerating mixing-chamber, the combination with a fuelsupply valve, of a throttle-valve controlling the vapor-outlet from said mixing-chamber, and a vacuum-controlling valve to regulate the supply of air to said mixing-chamber, said last-named valve and the opening it controls both being of larger area than the area of the relatively small orcontracted entrance to said flaring air-accelerating mixing-chamber.

7. In a carburetor for explosion-engines, the combination with a conical or flaring mixing-cl1amber, of a fuel-supply valve delivering to the said mixing-chamber, a throttle- .valve controlling the vapor-outlet from said mixing-chamber, a conical or tapering airchamber delivering at its smaller end to the smaller end of said mixing-chamber, and a vacuum-controlling air-inlet valve for said conical or tapering air-chamber.

8. In a constant-level carbureter, the combination with a conical mixing-chamber, and a conical air-chamber, said chambers having their smaller ends toward each other, of a fuelsupply valve, a vacuum-controlling air-inlet valve delivering to said conical air-chamber, and a throttle-valve controlling the vaporoutlet from said mixing-chamber.

9. A carbureter for explosion-engines provided with a conical or tapering mixing-chamber,-a fuel-passage opening into said chamber, a conical or tapering air-inlet chamber communicating at its smaller end with the smaller end of the mixing-chamber, and a vacuum-regulating valve controlling the entrance of the air-inlet chamber at the larger end of said conical or tapering air-inlet chamber.

10. In a carbureter for explosion-engines, the combination with a conical or flaring airaccelerating mixing-chamber, of a fuel-supply valve delivering to said mixing-chamber, a throttle-valve controlling the vapor-outlet from said mixing-chamber, positive connections between said throttle-valve and said fuel-supply valve whereby movements of one of said valves will automatically effect movements of the other, and a spring-pressed vacuchamber having its larger end towardsaid throttle-valve, and an air-inletcheckvalve controlling the entrance of air to said mixing-chamber.

12. In a carburetor for explosion-engines, the combination with a throttle-valve, of a conical or tapering air-chamber, an air-inlet valve controlling the entrance of air to said chamber, and a conical or flaring mixingchamber the smaller end of which is toward the smaller end of said air-chamber and the larger end of which is toward said throttlevalve, and a fuel-supply-regulating valve controlling a fuel-feed passage.

13. In a carbureter for explosion-engines, the combination with a throttle-valve, of a jacketed conical or flaring air-accelerating and mixing chamber having its larger end toward said throttle-valve, means for introducing a heating medium to the chamber forming the jacket for said mixing-chamber, and a check-valve for controlling the entrance of air to said mixing-chamber.

14:. In a carbureter for explosion-engines, the combination with a throttle-valve, of a conical or tapering air-chamber, a valve controlling the supply of air to said chamber, a conical mixing-chamber having its larger end toward said throttle-valve and its smaller end toward said air-chamber, a fuel-supply passage opening into said mixing-chamber, a

valve for controlling the fuel-supply, a fuel-' reservoir communicating with the said fuelsupply passage, a valve controlling the inlet of the fuel to said reservoir, and a float for controlling the said reservoir inlet-valve.

15. In a carbureter for explosion-engines, the combination with a conical air-chamber, of a conical mixing-chamber the larger end of which is toward the smaller end of said airchamber, a vacuum and air-supply controlling-valve governing the admission of air to said chamber, a valve controlling the supply of fuel, a valve controlling the vapor-outlet of the carbureter,and positive connections between said fuel-supply and vapor-outlet con trolling valves whereby adjustment of one of said valves will automatically eiTect adj ustment of the other.

16. Inacarbureterforgas-engines,the combination with a mixing-chamber having a fuel-inlet opening into said chamber, of a needle-valve controlling said fuel-inlet, a rotatable throttle-valve provided with an operating lover or handle, a controlling cam-plate mounted on said leverorhandle eccentrically relative to the axis of movementof said throttle-valve, and a lever connected with said needle-valve, and operable from the eccentricallymounted controlling cam plate, so that when the throttle-valve is turned, to be opened or closed, the said needle-valve will be automatically adjusted through the said needle-valve lever to efiect a proper regulation of the fuel-feed corresponding with the position of adjustment of the throttle-valve and the speed of the engine resulting from such adjustment of the throttle-valve.

17. In a carbureter for gas-engines, the combination with a mixing-chamber having a fuel-inlet opening into said chamber, of a needle-valve controlling said fuel-inlet, arota'table throttle-valve provided with an operating lever orhandle, a controlling cam-plate eccentrically mounted relative to the axis of movement of said throttle-valve and movable therewith, and a lever connected with said needle-valve and operable from the eccentricallymounted controlling cam plate, so that when the throttle-valve is turned, to be opened or closed, the said needle-valve will be automatically adjusted through the said needle-valve lever to eitect a proper regulation of the fuel-feed corresponding with the position of adjustment of the throttle-valve and the speed of the engine resulting from such adjustment of the throttle-valve.

18. In a carbureter for gas-engines, the combination with a mixing-chamber having a fuel-inlet opening into said chamber, of a needle-Valve controlling said fuel-inlet, a rotatable throttle-valve provided with an operating lever or handle, a controlling camplate adjustably mounted on said lever or handle eccentrically relative to the axis of movement of said throttle-valve, and a lever connected with said needle-valve, and operable from the eccentrically-mounted controlling cam-plate, so that when the throttlevalve is turned, to be opened or closed, the

Y said needle-valve will be automatically adjusted through the said needle-valve lever to effect a proper regulation of the fuel-feed corresponding with the position of adjustment of the throttle-valve and the speed of the engine resulting from such adjustment of the throttle-valve.

19. In a carbureter for gas-engines, the combination with a mixing-chamber having a fuel-inlet opening into said chamber, of a needle-Valve controlling said fuel-inlet, a rotatable throttle-valve provided with an operating lever or handle, a controlling camplate eccentrically mounted relative to the axis of movement of said throttle-valve and movable therewith, a lever connected with said needle-valve, and adjustable connections intermediate the said controlling cam-plate and the said needle-valve lever, so that when the throttle-valve is turned, to be opened or closed, the said needle-valve will be automatically adjusted through the said needle-valve lever to effect a proper regulation of the fuelfeed corresponding with the position of adjustment of the throttle-valve and the speed of the engine resulting from such adjustment of the throttle-valve.

20. In a carbureter for gas-engines, the combination with a mixing-chamber having a fuel-inlet opening into said chamber, of a needle-valve controlling said fuel-inlet, a rotatable throttle-valve provided with an operating handle or lever, a cam-plate eccen-- trically mounted relative to the axis of movement of said throttle valve and movable therewith, a lever connected with said needle-valve, and operable from said cam-plate, and adjusting means for varying the extent of movement of said needle-valve lever under the action of said cam-plate; so thatwhen the throttle-valve is turned, to be opened or closed, the said needle-valve will be automatically adjusted through the said needle-valve lever to eflect a proper regulation of the fuelfeed corresponding with the position of adj ustment of the throttle-valve and the speed of the engine resulting from such adjustment of the throttle-valve.

21. An oil-reservoir for carbureters having an elongated inlet stem or projection provided with inlet-ports, a-protecting-screen encircling said stem and carried thereby to prevent ingress of foreign particles at the inletports, a sediment-trap surrounding said stem and screen, said trap extending below the said stem and having a pocket at its lower end to receive foreign particles which gravitate thereto, and a supply-pipe entering said tra 2%. An oil-reservoir for carburetors having an elongated inlet stem or projection provided with a direct passage and with side inlet-ports, a cylindrical protecting-screen surrounding and supported by said stem, a removable sediment-trap surrounding said inlet-stem and screen, said trap extending below the said stem and having a pocket at its lower end to receive foreign particles which gravitate thereto, and a supply-pipe entering said trap.

23. An oil-reservoir for carbureters having an elongated inlet stem or projection provided with a direct passage and with side inlet-ports, a cylindrical protecting-screen surrounding and supported by said stem, and an axiallyadjustable sediment-trap surrounding said inlet-stem and screen and provided with a supply-opening, said trap extending below the said stem and having a pocket at its lower end to receive foreign particles which gravitate thereto.

24. In a carbureter for explosion-engines, the combination with a fuel-reservoir and means for maintaining a constant level of liquid fuel therein, of a throttle outlet-valve from the carbureter, a conical or flaring airaccelerating mixing-chamber or passage-way communicating with the chamber of the said reservoir, and having its larger end toward the said throttle-valve, and an automatic airinlet and vacuum-regulating valve controlling the inlet of air to the said mixing-chamber.

25. In a carbureter for explosion-engines, the combination with a fuel-reservoir and means for maintaining a constant level of liquid fuel therein, of a throttle outlet-valve from'the carbureter, a conical or tapering airinlet chamber, a conical 0r flaring, air-accell regulating valve controlling the inlet of air 10 V erating mixing-chamber or passage-Way 10- to the said air-inlet chamber. cated between the said air-inlet chamber and In testimony whereof we affix our signathe said throttle-valve, said mixing-chamber tures in presence of two witnesses.

or passage-way communicating with the said THOMAS L. STURTEVANT. fuel-reservoir, and having its smaller end ad- THOMAS J. STURTEVANT. jacent to the smaller end of said air-inlet Witnesses:

chamber and its larger end toward the said L. H. STURTEVANT,

throttle-valve, and an automatic vacuum- RUBERT M. GAY. 

